# Copyright 2020 Huawei Technologies Co., Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ============================================================================
"""
Description: This file is used for some common util.
"""
import io
import os
import shutil
import json
from pathlib import Path

from urllib.parse import urlencode
import numpy as np
from PIL import Image

from mindinsight.lineagemgr.common.exceptions.exceptions import LineageParamValueError


def get_url(url, params):
    """
    Concatenate the URL and params.

    Args:
        url (str): A link requested. For example, http://example.com.
        params (dict): A dict consists of params. For example, {'offset': 1, 'limit':'100}.

    Returns:
        str, like http://example.com?offset=1&limit=100

    """

    return url + '?' + urlencode(params)


def delete_files_or_dirs(path_list):
    """Delete files or dirs in path_list."""
    for path in path_list:
        if os.path.isdir(path):
            shutil.rmtree(path)
        else:
            os.remove(path)


def get_image_tensor_from_bytes(image_string):
    """Get image tensor from bytes."""
    img = Image.open(io.BytesIO(image_string))
    image_tensor = np.array(img)

    return image_tensor


def compare_result_with_file(result, expected_file_path):
    """Compare result with file which contain the expected results."""
    with open(expected_file_path, 'r') as file:
        expected_results = json.load(file)
        assert result == expected_results


def deal_float_for_dict(res: dict, expected_res: dict, decimal_num=5):
    """
    Deal float rounded to specified decimals in dict.

    For example:
        res:{
                "model_lineages": {
                    "metric": {"acc": 0.1234561}
                }
            }
        expected_res:
            {
                "model_lineages": {
                    "metric": {"acc": 0.1234562}
                }
            }
    After:
        res:{
                "model_lineages": {
                    "metric": {"acc": 0.12346}
                }
            }
        expected_res:
            {
                "model_lineages": {
                    "metric": {"acc": 0.12346}
                }
            }

    Args:
        res (dict）: e.g.
            {
                "model_lineages": {
                    "metric": {"acc": 0.1234561}
                }
            }
        expected_res (dict):
            {
                "model_lineages": {
                    "metric": {"acc": 0.1234562}
                }
            }
        decimal_num (int): decimal rounded digits.

    """
    for key in res:
        value = res[key]
        expected_value = expected_res[key]
        if isinstance(value, dict):
            deal_float_for_dict(value, expected_value)
        elif isinstance(value, float):
            res[key] = round(value, decimal_num)
            expected_res[key] = round(expected_value, decimal_num)


def _deal_float_for_list(list1, list2, decimal_num):
    """Deal float for list1 and list2."""
    index = 0
    for _ in list1:
        deal_float_for_dict(list1[index], list2[index], decimal_num)
        index += 1


def assert_equal_lineages(lineages1, lineages2, assert_func, decimal_num=2):
    """Assert lineages."""
    if isinstance(lineages1, list) and isinstance(lineages2, list):
        _deal_float_for_list(lineages1, lineages2, decimal_num)
    elif lineages1.get('object') is not None and lineages2.get('object') is not None:
        _deal_float_for_list(lineages1['object'], lineages2['object'], decimal_num)
    else:
        deal_float_for_dict(lineages1, lineages2, decimal_num)
    assert_func(lineages1, lineages2)


def get_relative_path(path, base_path):
    """
    Get relative path based on base_path.

    Args:
        path (str): absolute path.
        base_path: absolute base path.

    Returns:
        str, relative path based on base_path.

    """
    try:
        r_path = str(Path(path).relative_to(Path(base_path)))
    except ValueError:
        raise LineageParamValueError("The path %r does not start with %r." % (path, base_path))

    if r_path == ".":
        r_path = ""
    return os.path.join("./", r_path)
